A FactoryBean that automates the creation of a
SimpleJobRepository using non-persistent in-memory DAO
implementations. This repository is only really intended for use in testing
and rapid prototyping. In such settings you might find that
ResourcelessTransactionManager is useful (as long as your business
logic does not use a relational database). Not suited for use in
multi-threaded jobs with splits, although it should be safe to use in a
multi-threaded step.